FMDS is comprised of two services: TT FMDS Feed and TT FMDS Responder. The TT FMDS Feed
subscribes to gateways and records prices to historical data files.
The TT FMDS Responder listens and fulfills requests for historical
data from X_STUDY.

FMDS supports subscription of up to
2000 instruments. Once you subscribe to a contract or spread, FMDS
is always recording. To ease the impact of historical data requests
on your network, X_STUDY chunks requests into small messages and
only asks for the number of bars to fill the screen.

Example:
You may receive a hundred one-minute bars in the chart, but thousands
more may be stored in FMDS.

Notes:

The connection between
X_STUDY and FMDS is non-persistent, only connecting as requests
for new instruments or new rollup times are made.

FMDS is able to authenticate
either directly to the gateway or with TT User Setup. Depending
on the authentication method used, additional configuration may
be needed. Refer to FMDS Authentication for
details.

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